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Top: the manual for Wario Blast contains a secret password. The tiny screenshot next to the section explaining passwords has the barely visible password "2264" already input. While one would logically assume that this is merely a regular password one would obtain during gameplay, this password is actually manual-only and is not given out by the game itself.

Bottom: while most passwords simply start off the game in a different level, this one starts the game at the beginning, but with all power-ups unlocked. Note how Wario is already riding the Moto (the bike he obtains as his last power-up) and can set several bombs with large explosions, while regularly he can only set a single bomb with a small explosion at the beginning of the game.

Note that playing through the game as both Wario and Bomberman and writing down their passwords reveals that Bomberman's passwords are Wario's, but reversed. As such, this allows the player to also figure out the password "4622" for the same effect, but playing as Bomberman instead. This one is not given anywhere at all, neither the game nor the manual, and relies entirely on pattern recognition to deduce.